I have a tiled background representing the ground, it has the solid behaivor so the player stands on it, the problem is that the background has some transparency on top of it because it has grass and plants, I need the player to stand a little below where the background is, so it looks like it stands on the grass and not flying above it.

You can see how the blue box represents the image of the tiledBackground, it needs to have transparency to have the gras grow above it.

I thought I could do this defining an offset for the tiledBackground, but I cant find it.